configure: error: unable to find xerces header files

[Mustapha Aoussar]

I am trying to install *Shibboleth 2 SP* but when i try to built *
XML-Security-C* i get this error:
configure: error: unable to find xerces header files

I have already tried to install Xerces-C++ 3.1.1.
I post my issue here:
http://stackoverflow.com/questions/16823576/xml-security-c-configure-error-unable-to-find-xerces-header-files

Please help!
Thank you so much!
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